It really depends on, what kind of equipment and power you have running it. Myt set up with 4 6 1/4 in the tower with about 100 watts a piece you can hear it pretty well. However on my mastercraft with factory two clarion's and factory amp I could not hear it. In reality I never hear the tunes, when your doing tricks or most of the time in my sets. I would say four to six with an amp with good clean power and you will hear it.
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